EPMLTest.java

import java.util.Random;

import org.ejml.simple.SimpleMatrix;


public class EJMLTest {
	private static SimpleMatrix getRandomMatrix(int rowCount, int columnCount) {
		Random random = new Random();
		int cellValueLimit = 9;
		
		SimpleMatrix matrix = new SimpleMatrix(rowCount, rowCount);
		for (int r = 0; r < rowCount; r++) {
			for (int c = 0; c < columnCount; c++) {
				matrix.set(r, c, random.nextInt(cellValueLimit));
			}
		}
		return matrix;
		
	}
	
	public static void main(String[] args) {
		int rows = 300;
		int cols = rows;
		
		SimpleMatrix matrix1 = getRandomMatrix(rows, cols);
		SimpleMatrix matrix2 = getRandomMatrix(rows, cols);
		
		long computationStartTime = System.currentTimeMillis();
		SimpleMatrix multipliedMatrix = matrix1.mult(matrix2);
		long computationEndTime = System.currentTimeMillis();
		
		System.out.println(new StringBuilder("Multiplication took ").append(computationEndTime - computationStartTime).append(" ms"));
		System.out.println(multipliedMatrix.determinant());
	}
}